CCP §2025.410: (a) Any party served with a deposition notice that does not comply with Article 2 (commencing with Section 2025.

(a) Any party served with a deposition notice that does not comply with Article 2 (commencing with Section 2025.210) waives any error or irregularity unless that party promptly serves a written objection specifying that error or irregularity at least three calendar days prior to the date for which the deposition is scheduled, on the party seeking to take the deposition and any other attorney or party on whom the deposition notice was served. (b) If an objection is made three calendar days before the deposition date, the objecting party shall make personal service of that objection pursuant to Section 1011 on the party who gave notice of the deposition. Any deposition taken after the service of a written objection shall not be used against the objecting party under Section 2025.620 if the party did not attend the deposition and if the court determines that the objection was a valid one. (c) In addition to serving this written objection, a party may also move for an order staying the taking of the deposition and quashing the deposition notice. This motion shall be accompanied by a meet and confer declaration under Section 2016.040. The taking of the deposition is stayed pending the determination of this motion. (d) The court shall impose a monetary sanction under Chapter 7 (commencing with Section 2023.010) against any party, person, or attorney who unsuccessfully makes or opposes a motion to quash a deposition notice, unless it finds that the one subject to the sanction acted with substantial justification or that other circumstances make the imposition of the sanction unjust. (e) (1) Notwithstanding subdivision (d), absent exceptional circumstances, the court shall not impose sanctions on any party, person, or attorney for failure to provide electronically stored information that has been lost, damaged, altered, or overwritten as the result of the routine, good faith operation of an electronic information system. (2) This subdivision shall not be construed to alter any obligation to preserve discoverable information.